Grinding-mill.



No. 761,333. PATENTBD MAY 31, 1904. T. L. & T. J. STURTEVANT.

GRINDING MILL. APPLIUATIONIPILBD'JAN.23. 1902.

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PATENTED MAY 31, 1904. T. L. & T. J. STURTEVANT.

GRINDING MILL. APPLICATION n'Lm) JAN. 2a. 1902.

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. No 761,333. I PATENTED MAY 31, 1904.

I T. L; 6: T. J. STURTEVANT.

GRINDING MILL Arrmornon nun an. 23. mp2. no menu. Burs-sum s.

Np. 761,333. PATBNTED' MAY 31, 1904.

'r. L. & T. J. STURTBVANT.

GRINDING MILL. APPLICATION FILED JAN. 23, 1902.

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Patented May 31, 1904..

UNITED STATES PATENT O FICE.

THOMAS L. STURTEVANT, OF QUINCY, AND THOMAS J. STURTEVANT, OF

NEWTON CENTER, MASSACHUSETTS, ASSIGNORS TO STURTEVANT MILL COMPANY, OF PORTLAND, MAINE, A CORPORATION.

GRINDING-MILL.

' SPECIFICATION forming part of Letters Patent No. 761,333, dated May 31, 1904." Application filed .l'anuary 23, 1902. Serial No. 20,919. (No model.)

To all whom it may concern:

Be it known that we, THoMAs 'L. STURTE- VANT, residing at Quincy, in the county of Norfolk, and THoMAs J. STURTEVANT, residing at Newton Center, in thecounty of Middle- .sex, State of Massachusetts, citizens of the United States, haveinvented certainnew and useful Improvements in Grinding-Mills, of which the following is a specification, refer- IO ence being bad therein to the accompanying drawings.

This invention relates to that class of grinding-mills for reducing rocks, ores, and other substances and comprising millstones which 5 are arranged vertically and which class of mills has therefore come to be known as vertical mills.

Our invention has for. itsobject to improve 7 the class of mills referred to in such a manner as to render them more efficient as well as more convenient in use.

, In the accompanying drawings, Figure 1 is a vertical section of a mill embodying our invention. Fig. 2 is a detail view to show the 5 runner-head provided with a clamping-hub.

Fig. 3 is a detail view .to show the divided cover for the clamping-hub. Fig. 4 is a detail View of the feed-screw, and Fig. 5 is a detail view to illustrate the constructions whereby 3 the feed-screw is operatively connected with the runner-head. 7 Figs. 6 and 7 are detail views to show the scrapers and their means of attachment to the runner-head. Figs. 8, 9, and 10 are detail views illustrative of the hopper and the hopper-feeding mechansm;

Referring to the drawings, .12 denotes a suitable frame provided with standardsl in which is journaled the mill-shaft 14, provided with a driving-pulley 15, which latter in prac- 4 tice will preferably have a clutch connection with said shaft, but which clutch connection is for simplicity of illustration omitted from the present drawings, as it forms no part of the present invention; Themill-shaft will preferably have an adjustable thrust ballbearing comprising balls 16, interposed between collars 17, and an adjusting-screw 18, impinging against a collar 19 and secured in any desired position of adjustment by the handled nut 20.

Suitably mounted on the frame 12 is a cas-. ing 21, to whichis bolted a bearing 22 for one end of the mill-shaft and on which casing is mounted a frame 23, in which is journaled afeed-shaft 24, provided with a winged feedwheel 25 and with a driving gear-wheel 26, meshing with a pinion 27 on a short shaft 28,

'journaled ina bracket 29 and provided with provided, so that-the said end flanges preventdirt or gritfrom getting into the bearings of the feed-shaft. Mounted on the hopper-frame isa weighted feed-regulating lever 32,the

inner end of which is provided with a gate 33, adjustable with said lever and the position of adjustment of which will regulate the outlet,

from the hopper relative to the wings 34 of the feed-wheel.

The feed-regulating lever may be adjusted by means of-the regulatingscrew 35, which latter may be held in any desired position of adjustment by a lock-nut 36,

and the said feed regulating levermay be positively held inplace by means of a bandled set-screw 37, impinging against the hop per-frame.

The bed-stone 38 is suitably attached to the frame or casing 21, and the runner-stone 39 is connected with the mill-shaft 14 by means ofa runner-head 40,'to which said runner-stone is secured in any suitable or'well-knownmanner. The runner-head 40 is provided with a hub comprising a portion 41 integral with said runner-head and a hub-cap 42, secured to the hub portion 41 by bolts 43, the hub portion and hasa hooked portion 48, which engages The part 46 is preferably ranged a feed-screw 52, provided at one end with peripheral lugs 53, adapted to fit in an annular recess 54, formed in the hub portion of the runner-head, and outside of which recess is an overhanging flange 55, partly cut away to afiord openings 63 to permit the peripheral lugs of the feed-screw to be entered into the said annular recess 5 and then when one part, either the runner-head or the feedscrew, is partially rotated with reference to the other to bring the feed-screw lugs 53 beneath the hub-flange 55 the longitudinal stops 56, with which the screw is provided, will come in contact with the sides of the openings 63 in the overhanging flange 55, and thus the said feed-screw will be operatively locked to the said runner-head, so as to rotate therewith, and cannot be disconnected or withdrawn therefrom without first reversing the motion by which it was locked. The rotation of'the runner-head in the direction denoted by the arrow in Fig. 5 will cause the parts to remain locked together, and a partial reverse rotation of the runner-head or a partial rotation of the feed-screw in the direction indicated by the said arrow when the runner-head is stationary will enable the parts to be disconnected.

The runner-head 40 is provided with dovetailed grooves 57, in which balance-weights 58 are preferably removably and adjustably secured by set-screws 59, and said runner-head is also provided with dovetailed recesses or pockets 60, in which are attached suitable blocks 61, to which are secured scrapers 62, overhanging the periphery of the runnerstone. These scrapers carry the reduced material in the chamber of the mill aroundto the discharge-opening (not shown) in the millcasing.

The construction herein shown and described whereby the feed-screw is operatively connected with the feed-shaft by being locked to the hub portion of the runner-head which is splined to said shaft, is an important improvement over the constructions heretofore employed in this class of mills and in which the feed-screws were attached to the feedshafts by means of set-screws and which attachment was not always reliable, as the feedscrews were liable at times to slip on the shafts and the latter were often-badly scarred by reason of this slipping action. The divided clamping-hub of the runner-head is also an important feature of the invention, as it provides a convenient and satisfactory as well as areliable fastening. The hinged or separable cover for the hub of the runner-head is also a convenient construction, as it admits of access to the clamping-hub of the runner-head 7 from the outside of the casing and after the millstones have been placed in operative position. The construction whereby the scrapers are secured to blocks attached to the runnerhead is also found to be convenient and economical, as this construction permits the scrapers to be readily replaced when necessary. Also the construction of the winged feed-whee1, provided with guard-flanges between which the spout of the hopper extends, 30

is deemed an important improvement in that it provides in connection with the adjustable gate a reliable and easily-regulated feeding device, while the guard-flanges prevent rit and dirt from the incoming material from 5 the feed-screw might be operativel y connected 9 with the recessed hub of the runner-head by a single peripheral lug and stop extending through a single opening in the o\ 'erhanging flange of the said hub, and other variations within the limits of mechanical skill might be made in the details of the invention.

Having thus described our invention, we claim and desire to secure by Letters Patent- 1. In agrinding-mill, the combination with the mill-shaft and bed and runner stones, of a runner-head to which the runner-stone is attached and which is provided with a hub having an undercut recess, and a feed -screw mounted on said shaft and provided at one end with one or more peripheral lugs by which it 5 is operatively connected with the undercut re cess of said hub so as to rotate with said run ner -head and be held against longitudinal movement.

2. In a grinding-mill, the combination with 1 I O the mill-shaft and bed and runner stones, of a runner-head to which the runner-stone is attached and which is provided with a hub having an annular recess and a flange overhanging said recess but partly cut away to form 5 one or more openings, and a feed screw mounted on said shaft and provided at one end with one or more peripheral lugs and one or more longitudinal stops, said lug or lugs being of proper size to enter the said opening or openings in the overhanging flange of the hub and said stop or stops serving as a point or points of engagement with the end wall or walls of said opening or openings to cause the said feed-screw to rotate with the said hub 5 when the parts described are properly assembled.

3. Means for securing the feed-screw of grinding-mills to a rotating runner-hcml comprising a hub on the runner-head having an 3 undercut recess the overhanging flange of which is partly cut away, radial'stops within said recess, and radially-projecting lugs on the feed-screw which enter said recess and take their bearing against said stops.

4. In a grinding-mill, the-combination with a runner-head provided with radially-arranged recesses or pockets near its periphery, of scraper-supporting blocks adjustably mounted in said recesses or pockets, and scrapers removably attached to said blocks and overhanging the periphery of the runner-stone.

5. In a grinding-mill, the combination with a runner-head provided with radially-arranged undercut recesses or pockets near its periphery, of scraper-supporting blocks adjustably mounted in said recesses or pockets, and

scrapers removably attached to said blocks and overhanging the periphery of the runnerstone.

6. In a grinding-mill, the combination with the grinding or reducing devices, of a hopper provided with a depending spout, a rotating winged feed-wheel located below said hopper and serving to cause the material in the hopper to be properlyfed to the grinding or reducing devices, said feed-Wheel having end flanges between which said spout extends, an adjustable gate adjacent to said spout and cooperating with the wings of said feed-wheel, to regulate the feed of the material, an adjustable weighted lever by which saidgate is carried, and a stop to prevent'said'gate from opening by the Weightof said lever.

7 In a grinding-mill, the combination with the grinding or reducing devices, of a hopper provided with a depending spout, a rotating winged feed-wheel located below said hopper and serving to cause the material in the hopper to be properly fed to the grinding or reducing devices, said feed-wheel having end flanges between which said spout extends, and an adjustable gate cooperating with the wings of said feed-wheel to regulate the feed of the material, an adjustable weighted lever by which said gate is carried, and a regulatingscrew for varying the position of said lever.

I 8. In a grinding-mill, the combination with eral' lugs by which it is operatively connected with the undercut recess of said hub so as to rotate with said runner-head and be held against longitudinal movement.

In testimony whereof we aflix our signatures in presence of two witnesses.

THOMAS L. STURTEYANT.- THOMAS J. STURTEVANT.

Witnesses: V

- LLOYD MAKEPEACE,

O. B. MONEY. 

